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Several Charges in the Neighbourhood of Point P Produce an Electric

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Several charges in the neighbourhood of point P produce an electric potential of 6.0 kV (relative to zero at infinity) and an electric field of N/C at point P.Determine the work required of an external agent to move a 3.0- μ\mu C charge along the x axis from infinity to point P without any net change in the kinetic energy of the particle.  Several charges in the neighbourhood of point P produce an electric potential of 6.0 kV (relative to zero at infinity)  and an electric field of N/C at point P.Determine the work required of an external agent to move a 3.0- \mu C charge along the x axis from infinity to point P without any net change in the kinetic energy of the particle.   A) 21 mJ B) 18 mJ C) 24 mJ D) 27 mJ E) 12 mJ


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